Bolt-anchor.



D. H. HAYWOOD.

BOLT ANCHOR.

APPLICATION FILED JAN. 5, 1910.

Patented 111211221, 1911.'

1 l 1 l I i 1 i l D 1NVENT0R "entre entras ramena? marion..

DANIEL HOWARD HAYWOOD, OF Al\l'}3l'\7l YORK, N. Y.

BOLT-ANCHOR. i

Specification of'Letters Patent. lgtgented M131'. 21, 1911.

Application tiled January 5, 1910. Serial No. 536,454.

To o/l'' whom it may concern:

Bc it known thatl, DANIEL HOWARD Hm woon, a citizen ot the United States of America, and a resident of New York, county and State of New York, have invented 'certain new and useful Improvein .ltilti-rliiclioi's, of which the tollowing is a specification, reference being had to the accompanying drawings, forming a part thereof. Y My invention relates to bolt anchors of the class employed 'for securing bolts lin` holes in u'alls'olibrick, stone, and the like, and consist-s: first, in composing the expansible shell of a` bolt anchor in part of a rela tively sott material and in part ot a relatively hard material, the object thereof being to reinforce and strengthen the shell and render it more durable and less easily dan'iaged, and particularly where, the hard -1netal portion constitutes the lining of the shell. to strengthen the bore thereof; and second, in a novel form yand contigurationof th`c interior bore of segmental bolt anchor shells. the same comprising substantially cylindrical segments of uniform radius tl'iroughout, but which converge from. one end of the shell toward 'the other to form a tapered bore, the object of this portion of in y invention being to provide that the shell bore shall properly vlit the cylindrical bolt with which the shell is to be employed, when the bolt is inserted all thel way and the shell ,is expanded;

.ln order that my invention may be thoroughly miderstood, I will now proceed'to describe an embodiment. thereof, having referencc to the accompanying drawings-illustrating thesame, and will then point out the novel ifeatures in claims. V

lin the drawings: Figure l is a view in central longitudinal section through a bolt anchor emistrueted `in accordance with my inventimi. Fig. 2 is an end view ot' vthe. same looking toward the inner end thereof.

Fig. 3 is an end view ol the same looking.

tmvard the outer end thereof. Fig. t is a sectional `view similar to Fig. l,.eXcept that a bolt is shown as having been inserted 'therein and the anchor segments have been expanded thereby. Fig. 5 is an inner end view of the bolt and anchor as shown in Fig. l. iig. 5 is an inner end view of a bolt anchor con'iposed ot three segments instead oi two as the other tigures. Figs. 'i' and S are views in longitudinal section ot moditied forms of the bolt. anchor.

liteferring first to the form, otmy invention illustrated in Figs. 1. to 5 inelusive,rthe device comprises a substantially cylindrical shell composed'ot' two segments l0, ll divided upon a medial plane as' at 12. The shell is of composite tform, being composed ot an outer relatively soft metal portion 13 and an inner lining lil: ot' relatively hard metal. 'llhe harder inetal lining is interiorly provided with screw threads to receivel a bol.; and united in any suitable manner to the softerv metal backing 13. As a convenient method of mamiiacture, the. linings may first be constructed in any suitable inanner, and thereafter placed in molds wherein the bookings are cast.

The interior bore of the shell is tapered (see Fig. l) 4so that when a bolt of substantially cylindrical form is inserted therein, the segments will be expanded as is shown in Fig. Il. ,ln thus being expanded, the softer metal backing of the shell will be forced againstthe walls of the hole in whichit is inserted, and compelled to assume the configuration thereof, the soft metal being caused substantially to flow whereby such intimate engagement will be otlected between it and the walls of the hole as to anchor the shell securely in place. Sott metal anchors expanded by the bolt to be held in place are incominon use at the present day, but so 'tar as lxam aware, they arel in no case reinforced by hardermetal portions, and particularly in no case are they provided with a hard metalV lining having threads,` for engagement with the threads of the bolt to be held in place. The consequence is that either threads have to be formed inV they solt metal bore by the screw as it being forced into the anchor, in which case but imperfect threads `are formed, and the bolt is not securely held .in place, or it the shell be initially threaded, these threads are apt to bestripped by the bolt as it is being inserted, especially when the hole in which the` anchor insertcdis slightly smaller tha'ii it should be, and in any event, a distortion of every portion of., the Ishell is likely to result. -By the use of the hard metal Alining` of my present inven tion, l'ret.ajn the advantages following Ytrom the use ot the sott metal wherein it is caused n,to assume the shape of the hole, whi le avoiding the disadvantages above en iunel'ated. lt will be understood that in the broad aspect of my invention, l do not wish to be limited to employing the relatively/hard metal rei inforcement as a lining as obviously it may be otherwise disposed. and many benefits thereby obtained. 'Different metals may be employed in the construction of Vthe anchor, to suit different conditions and they may also be varied with respect to the relativo degree of hardness thereof; for instance, in some cases a. quite soft metal such as vlead or lead composition may be employed in combination with a much harder metal such as iron, while in other cases both of the metals may be somewhat soft though one softer than the other,-one, say, antimony and the other, lead, while in other cases they may be both somewhat hard though one harder than the other,--one metal being, say, copper, and the other, iron or steel.

I preferably form the interior threaded bore of theshell of such shape (disregardingthe threads) as to represent portions of a cylinder or cylinders of uniform diameter t rougl'iout, so that when the anchor is expanded, the walls will lit the bolt as is shown in Fig. 5. When the segments are in their contracted condition, prior to use, the inner end of the shell appears somewhat as is shown Ain Fig. 2, the bore being bounded at such end by two arcs, whose radii are. equal, and equal to half the diameter of the bore at the opposite end, but the centers of which are apart, each having approached the arc of the other center. Similarly, the bore in a cross section at any point throughoutthe device would be represented byarcs of circles whose radii are still equal to one-half the diameter of the bore at its greatest portion, but whose centers progressively move away from each other from a position of coincidence at one end to the position rcferred to in 'connection with the end view of Fig. 2 at the other end. The advantage of this form of bore is that as the bolt is forced into the shell there is no tendency to distortion at right angles to the expanding movement of the segments, z'. c. the movement from the position shown in F ig. 1 to the position shown in Fig. 4t; andthe threads, viewed transversely of the shell, will substantially fit the threads of the bolt at Aall points, as appears in Fig. 4;.

It is, of course, true that more than two i segments may be employed and in Fig.

I have shown an anchor comprising three segments but it will be noted that in this case, as in the'construction shown in the other figures, each segment in cross section is bounded'upon the inside by arcs of circles whose 'diameter' equals the diameter at the opposite end of the shell.

It will also be readily understood that it is immaterial whether or not the segments arc united at their outer ends as is shown in Fig. l, or are divided throughout their entire. length as is shown in Fig. 1, both con structions being well known in this art, and both constituting expansible shells. In Fig. 7 the interior bore is threaded at intervals, the portions 15l between the threaded portions being unthreaded. This construction is sometimes advantageous in that it renders the device adapted for use with threads which do'not accurately fit the threads of the shell. For instance, a bolt having a greater or less number of threads to the inch than the threaded portion of the shell will co-act with sufficient turns of the thread befor the want of registry is sufficient to be objectionable. Thereafter by leavingr a blank space, a fresh set of threads will again coincide with other threads ofthe bolt and so on` A bolt anchor having this form of intermittent thread is one which is in use u on the marketat the present day, and the Aeatures of my invention may be readily applied thereto, if desired. Similarly, in Fig. S, I have shown the shell as provided interiorly with a plurality of projections 16 which being properly disposed in a helical line will constitute a mutilated screw thread, and which may be employed in place of the continuous screw threads illustrated in the other figures.

`What I claim is:

v l. A bolt anchor comprising an expansible shell composed in part of a relatively soft n'iaterial and in part of a relatively hard material, the hard `and soft elements being arranged one within the other.

2. A bolt anchor comprising an expansiblo shell longitudinally divided to form segment-s and composed in part of a relatively soft material and in part of a relatively hard material, the hard and soft elements being arranged one within the other. l

3. A bolt anchor comprising an expan-` sible relatively soft metal shell and a relatively hard metal expansible tubular rein forcement therefor.

4l. A bolt anchor comprising an ex v ansible shell composed ofva relatively soijt metal shell and an interior relatively hard metall ing longitudinally divided to form segments.

7. A bolt anchor comprising a relatively soft metal shell and a relatively hard metal screw-threa ded lining therefor, the said shell and lining being longitudinally divided to form segments.

8. A bolt anchor comprising a relatively hard metal tubular element which tapers from one end toward the other, and a relatively soft metal backing therefor Whose 5 thickness increases toward the smallerend of thefrst said element.

9. A bolt anchor comprising a relatively hard metal tubular shellwhose Walls are of substantially uniform thickness through- 10 out, and a relatively soft metal backing l whose Walls are of progressively increasing thickness from one end .to the other.

` 10. A bolt anchor comprising a Atubular relatively hard metal element- Whosel Walls 15 are of substantially uniform thickness throughout, and which tapers from one end toward the other, and a relatively soft metal backing therefor Whose walls progressivelyincrease in thicknesstoward the smaller end of the first said element. 2.)

l1. A bolt anchor comprisingvan expansible relatively soft metal shell, provlded with longitudinally disposed relatively hard metal reinforcing elements.' In witness whereof, I have my hand this 30 day of December, 1909.

- D. HOWARD HAYWOOD. Witnesses:

F. B. GRAVES, LYMAN S. ANDREWS, J r.

hereunto set 25' 

